When the FBI caught up with Matthew Rupert, it already was sitting on a mountain of evidence implicating the 28-year-old in a crime spree spanning three days and two states.
They had Rupert in writing, describing his plans to drive from Galesburg, Ill., to Minneapolis as lawlessness erupted after George Floyd's murder, and then on to Chicago to "riot this mf!!!"
They had photos of Rupert posing, head held high, as flames rose in the backdrop. They had video showing him looting a convenience store, doling out explosives to be thrown at police and walking out of a Nicollet Avenue Sprint store declaring, "I lit it on fire."
The FBI did not need an informant for the damning evidence — Rupert collected it himself. He posted it on his Facebook account, "El Ricco Rupert," and streamed his actions on Facebook Live for hours.
"Nothing like snitching on yourself," one follower remarked. Rupert recently pleaded guilty to arson and faces a five-year minimum federal prison sentence, a conviction built almost entirely on evidence he posted. He is not an aberration. More people are broadcasting their illicit acts on social media, effectively informing on themselves.
It's a trend called "performance crime," a bewildering phenomenon often driven by a quest for online clout and not limited to any age group, education level or ideology.
On Jan. 6, hundreds of supporters of former President Donald Trump streamed to the social media site Parler as they stormed the U.S. Capitol. Victoria White, a 39-year-old from Rochester, Minn., posted updates to Facebook of her participation, including daring police to "come get me," according to federal charges. Jonah Westbury, 26, of Lindstrom, Minn., published selfie videos inside the Capitol that day, charges say.
These crimes are growing more popular, said Ray Surette, criminologist and media professor at the University of Central Florida in Orlando. And they're making criminal investigations easier for law enforcement agents, who need look no further than a computer monitor to find a suspect.